It's true! Last Tbft, the record cobia was caught in the same place as the record jew. I've heard of YFT being caught in the bay. 3-4 weeks ago a black marlin was caught off Tomaree heads.
I personally think it's due to the amount of bait that is in the bay. Also the fact that the bay is 2 & 1/2 times the size of Sydney harbour!
You gotta love Port Stephens.